Those look like a nice size.
If you use CA to glue in the tubes - it dries up super fast on antler so get the tubes in right the first push.
Sometime the center can be a little soft, so go easy on the sanding. I once pressed a little harder when it got soft and it just got worse. If you hit a softer spot like that the maybe harden it up with some CA (I haven't tried that because I haven't hit a soft patch like that again)